<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .container{
            width:200px;
            height:200px;
            background-color: #777;
            position: relative;
            left:200px;
            top:100px;
        }
        .box{
            width:200px;
            height:200px;
            background-color: red;
            position: relative;
            left:100px;
            top:50px;
        }
        
    </style>
</head>
<body>
    <div class="container"></div>
    <div class="box"></div>
</body>
</html>